condition mean min max ZT0-3 322.631219 322.631219 322.631219 ZT4-7 308.0400105 308.0400105 308.0400105 ZT8-11 309.9377815 309.9377815 309.9377815 ZT12-15 377.8182515 377.8182515 377.8182515 ZT16-19 332.5008495 332.5008495 332.5008495 ZT20-23 293.9449075 293.9449075 293.9449075